Slip form paver with slip form release



FIG. I

Jan. 14, 1969 M. l. HUD IS SLIP FORM PAVER WITH SLIP FORM RELEASE Filed July 27. 1966 FIG 4 INVENTOR. MICHAEL l. HUDIS ATTORNEYS.

United States Patent 3,421,418 SLIP FORM PAVER WITH SLIP FGRM RELEASE Michael I. Hudis, Brookfield, Wis, assignor to Rex Chainbelt Inc, Milwaukee, Win, a corporation of Wisconsin Filed July 27, 1966, Ser. No. 568,262 US. C]. 94-39 Int. Cl. Etllc 19/00 Claims ABSTRAGI OF THE DISCLOSURE This invention relates to improvements in slip form concrete pavers, and especially to a unique mounting for slip forms thereof so that they may be moved to release the forms or to adjust the width of the pavement.

Slip form pavers are road making machines that move over the path of a concrete road to be laid and carry forms for the sides of the concrete pavement. As the machine moves these forms slip along the side of the pavement and no permanent forms are necessary. The slip form road making machines may carry a variety of tools to level the concrete to the tops of the forms, vibrate the concrete, screed or smooth the concrete surface and finish the upper surface of the road. Slip form paving machines are themselves known in the art as shown for example by the patents to Perkins, et al., 2,869,931, 2,976,783 and 2,976,784.

The slip forms carried by the paving machine abut and define the edge of the concrete pavement which is being formed. Whenever the laying of the concrete is to be discontinued, such as overnight, for example, a bulkhead is set in place to extend across the pavement to define a straight end surface which will abut the concrete to be laid thereafter or the following day. This bulkhead is set in place well in front of the paving machine and the concrete is laid only up to this bulkhead which is allowed to stay in place while the concrete is hardening overnight. In order to start the paving operation again the next day, the bulkhead and side forms must be removed from the hardened concrete and the machine must be reset to the rear and over the hardened concrete so that the end face formed by the bulkhead is well forward of the machine and immediate to the new concrete to be laid. Heretofore it has been very difficult to guide the machine in the reverse direction over the previously laid concrete without damaging its edges such that the concrete must be repaired.

This invention provides a mounting for the slip forms of a slip form paver so they may be moved outwardly of the normal width of the pavement whereby the machine is readily driven in the reverse direction over the previously laid pavement. The slip forms may then readily be reset to the proper width and in engagement with the sides of the previously laid concrete pavement from which the paver may then proceed directly forwardly. A seal is provided at the top of the slip form to seal between the slip form and frame to prevent concrete from spilling over the slip form and fouling the mechanism which movably mounts the slip form and the endless tracks.

3,421,418 Patented Jan. 14, 1969 The specific mechanical means for movably mounting the slip forms from side frame beams of a slip form paver includes pivotal links connected to the slip forms and to the side beams so that on straightening the links the slip forms are moved inwardly of the machine from the beams. In order to move the pivoted links so that they assume at right angles to the side of the machine, a screw and nut operator is utilized.

Other features of the invention will be pointed out in the following description and claims and illustrated in the accompanying drawing, which disclose by way of example, the principle of the invention and the best mode which has been contemplated of applying that principle.

In the drawings:

FIGURE 1 is a front elevation view of a slip form paver to which the slip form release of this invention is applied;

FIG. 2 is an enlarged front elevation detail view of one slip form, the machine side frame, and the movable connection for mounting the slip form from the side frame and operator therefor constituting the subject of this invention;

FIG. 3 is an enlarged partial side elevation view looking along line 33 of FIG. 2; and

FIG. 4 is a partial sectional view along line 44 of FIG. 2.

Referring to the drawing, a slip form paver 5 is of the type generally known in the art, including a pair of side frames 6 each supporting an endless track 7 for mov ing the paver, the side frames being fixedly connected a spaced distance apart by a transverse frame portion 8. The paver may include the usual tools for paving the concrete road, such as a spreading mechanism 9.

In the slip form pavers each side frame 6 includes a side frame beam 10, FIGS. 1 and 2 and this side frame beam usually support-s or constitutes a slip form. This invention includes a face or slip form assembly 12 which is movably mounted from the side frame beams by means to be described.

The face form assembly 12 includes a plate comprising the slip form 14 which is secured to a. backing channel 16 by the flat headed bolts 18. Bolts 18 extend through vertical slots in channel 16 for vertical adjustment of form 14. Along the rear face of channel 16 are a pair of elongated blocks 20 fixedly mounted to the back of channel 16 and having holes therein for pivot pins 22. These pivot pins form a pivot point for articulated links 24 and 26. The other end of links 24 and 26 are secured by-means of pivot pin 28 to elongated blocks 30. These elongated blocks 30 are in turn removably secured to the side frame beam 10. In this manner the entire face form assembly 12 may be assembled and then applied to the side of the frame beam 10.

As shown in FIG. 4, when the links 24 extend at right angles to the side frame beam 10 the face form assembly 12 is at its greatest distance from the side frame beam ltl and thus defines the narrowest width of pavement between the two forms 14 of the slip form paver. By the links pivoting about their axes, the slip form 14 may be moved closer to the side frame beam 10, thus defining a greater distance between the forms across the width of the pavement.

A simple, easily accessible, and foolproof mechanism 35 is provided for moving the movably mounted face form assembly 12. This mechanism is mounted above a projecting angle 34 which extends under the top of the backing channel 16 to form a seal behind the face form assembly 12 to prevent concrete from getting into the track assembly 7. The mechanism specifically includes a screw 36 journalled in brackets 38 and 39 for rotational but not axial movement. The screw has a hexagonal head 37 which is easily accessible so that it may be rotated by the operator as desired. Mounted on the threads of screw 36 is a non-rotatable nut 40. One surface of nut 40 may bear against backing frame 41 extending from side frame and also mounting the brackets 38 and 39. It can be seen that upon rotating screw 36, nut 40 will partake of an axial movement along the screw. It is also noted that the screw is mounted parallel to the side frame 10. The nut 41) includes a slot 42 in its lowest surface for cooperating with a lug 44 extending from the top surface of backing channel 16. It can thus be seen that by rotating screw 36 via its head 37, nut 40 Will move longitudinally correspondingly moving lug 44 and backing channel 16 hence the face form assembly 12. On moving face form assembly 12 longitudinally, links 24 and 26 pivot about their ends to the side frame 10. To allow for the transverse movement of lug 44 relative to nut 40 the slot 42 is open ended as shown in FIGS. 2 and 3.

The seal defined by angle 34 and channel 16 and the height of the seal above the surface of the roadway Will prevent concrete from fouling up either the mechanism or the endless track 7. In operation, the slip form paver would operate as usual during a paving day with forms 14 of assemblies 12 defining the width of the roadway. At the end of the day, the paver is generally stopped after it has advanced beyond the bulkhead which is placed to define the end of the pavement. The pavement hardens overnight between the trail forms behind the machine and at the start of the next paving day the trail forms are removed and the paver is driven in the reverse direction so that the pavement is between the slip forms of the machine. As has been mentioned, it is very difiicult to avoid damaging the pavement which has been laid. However, utilizing the device of this invention all that need be done is to rotate screw 36, causing nut 40 to move on the screw and moving lug 44 and hence face form assembly 12 longitudinally, at which time the face form assembly will pivot about links 24 and 26 to move transversely relative to the longitudinal axis of side frame beam 10 and endless track 7. When the paver is in place for resuming operation, the screw 36 may be rotated in the opposite direction so as to pivot each assembly 12 about links 24 and 26 so that the face form assemblies engage the pavement which has been laid and will thus have exactly the correct width or distance between the forms 14 of assemblies 12. This same adjustment of the distance between forms 14 of face form assemblies 12 can be utilized to vary the width of the pavement, for example from a standard twenty feet to nineteen feet, eleven and one-eighth inches.

While the invention has been particularly shown and described with reference to a preferred embodiment thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention.

What is claimed is:

1. In a slip form concrete road paving machine of the type including, a pair of longitudinally extending endless tracks supported on side frame beams which in turn are fixedly spaced apart by a transverse frame portion,

and slip face forms carried by the side frame beams, the

improvements comprising; means mounting at least one of the slip face forms for transverse movement in a plane parallel to a longitudinal axis of the corresponding side 5 frame beam to vary as desired the space between the slip face forms, while keeping the face forms parallel to each other, a mechanism carried by the side frame and connected to the slip face form for operating and controlling the position of the slip face form relative to the side beam, and a seal between the slip face form and corresponding side frame beam to prevent concrete from spilling over the top of the slip face form.

2. In a slip form concrete road paving machine of the type including, a pair of longitudinally extending endless tracks supported on side frame beams which in turn are fixed spaced apart by a transverse frame portion, and slip face forms carried by the side frame beams, the improvements comprising; means mounting at least one of the slip face forms for movement relative to the corresponding side frame beam to vary as desired the space between the side face forms, the mounting means including a plurality of links, each link having one end pivotally connected to the movable slip face form and the other end pivotally connected to the corresponding side frame beam, and operator means for operating and controlling the slip face form position, the operator means including a screw mounted on the frame for rotational movement and extending parallel to the side frame beam, a nut threaded on the screw for movement axially of the screw as the screw is rotated, and cooperating means of the nut and face form to move the face form on the pivoted links to various positions relative to the side frame, the cooperating means including a slot in the nut transverse to the axis of the screw and a lug attached to the face form for sliding movement in the slot.

3. A road paving machine as defined in claim 2 wherein the slip face form includes a slip form seal mounted on a backing support channel.

4. A slip form concrete road paving machine as in claim 3 further comprising a concrete seal extending from the side frame and cooperating with the backing support channel at the upper end thereof.

5. A slip form concrete road paving machine as defined in claim 3 wherein the ends of the links are connected to the side frame and face form through the intermediaries of blocks removably secured to the side frame beam and blocks fixedly secured to the face form backing channel, the blocks supporting pivot pins for the links.

References Cited NILE C. BYERS, JR., Primary Examiner.

US. Cl. X.R. 94-46 

